US3452430A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing a magnetic head with a substantially bubble-free gap
Assignee: US Philips Corp
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Filing: 1964-05-07
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Granted: 1969-07-01
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Expires: 1984-05-07
Abstract
No abstract record available.
Inventors
- 👤 Johannes Otto Michael V Langen
- 👤 Johannes Wilhelmu Bastiaanssen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:55
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/187; G11B5/23; G11B5/235; C; C04; C04B; C04B35/00; C04B35/01; C04B35/26; C04B37/00; C04B37/003; C04B37/005; G11B5/232; C04B2235/00; C04B2235/65; C04B2235/656; C04B2235/6567; C04B2237/00; C04B2237/02; C04B2237/10; C04B2237/30; C04B2237/32; C04B2237/34; C04B2237/50; C04B2237/52; C04B2237/76; C04B2237/78; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49021; Y10T29/49032; Y10T29/49055; Y10T29/49057
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-30 | 1972-12-30 | 1973-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-30 | 1976-12-30 | 1977-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-30 | 1980-12-30 | 1981-07-01 | $7700.00 | Window Closed / Lapsed |